Drill-chuck.



N0. e9,507. PATENTED 001 29. 1907. A. J. MoALLISTER.

DRILL CHUCK APPLIUATION FILED OUT. @1906.

Ive iur .1

-- substantiallyon theline M in Fig. 5. Fig. 2 is a e d thereto. =1'is a top or plan view of the drill E v l n itms'rsm os rimsgrsnns rtv nmi 1 I DRILL-CHUCKQ-Y .gpeciflcationjof lretters ljatenti} v 'Bstent ed. oct.' 's,'1eo7.

.a ucs'son filed October a. i9'0s.- strains. 331 7371.

To m ii'my;cmn.-. Be l l that I, ALEXANDER. 'J. McALns'rsR, a

citizen of, the United States, residing at .Erie', in the conntfoi Erie and State of Pennsylvania,-have in- 1 vented-certain new and useful Improvements in Drill- Ghu'cks; and I'do hei'by'declare the following to he ,a full, cleanand exact description of the invention,

' such as willehableothers skilled in the art to which it appertains to nuke and use the same, reference being had to the accompanying drawings, andto the letters of reference marked thereon. forming part of this specification. l/ I My invention relates to chuck mechanism for drill collets, and hasiior its object the construction of mechanisrn which may attached to en ordinary drill collet in such a manner as to grasp the drill'b'elow the colletat the strongestpoint thereof and prevent the turning of the drill in the collet.

The features ofmy invention and objects accom plished thereby are hereinafter set forth and explained,

' and are illustrated in the accompanying drawings in which! I Figure 1 is a'view in elevation of my improved chuck mechanism with parts-thereof in section, the drill holding portion and drill being broken 061:, in section,

side view in;elevation of a drill'inserted in the drill holding portion of device. Fig. 3 is a c'entrel'section of a drill collet with the shank of a drill therein,

showing the-manner of securing the ring D and studs holding portion oi rny device looking in the direction of the-arrow y in Fig. 2. Fig. 5 is a plan view of the 'lowe r endof the drill holding portion of my device looking in the direction of the arrow 2 in Fig. 2.

Inthese drawings A indicates the usual-drill collet or stern of an ordinery power drill press. A (see Fig.3)

indicetes a tapered longitudinal opening or socket in the lower end thereof adapted to receive the tapered shank-B of the drill B. A indicates a transverse slot in said collet intercepting andcommunicating with the taperedsocket A, into which slot A the tang or upper end b of the drill shank B enters to prevent the drill from turning in the collet A. These parts A, A A', B, B, and-b, are oi'usual and ordinary construction. l

In the general use of drill collets great dilhculty is experienced by reason of the twisting off of the tang b,-

as shown in Fig. 2, while the balance of the drill B is still good, thereby allowing the drill to turn in the collct A, and rendering the drill valueless. In shops I employing-drill presses there may be found varying numbers of drills from which the tangs have been twisted. and it is to overcome this difiiculty {If twisting off the tangs, and to utilize drills .without tongs that I provide an internallyscrew-thrcaded sleeve C having .en inwardly projecting annular shoulder C at its upper end, which shoulder C fits loosely around the drill collet A. To retain this sleeve 0 uponthe drill collet A, I secure a. ring -I) nponthe collet A by means of one or more set-screws d, which I insert through an opening c in the side of the sleeve 0. Near the lowerv end of the collet A I secure thereto one or more studs a for the purpose hereinafter set forth. Upon the colletA. I then place en externally screw threaded sleeve E, the threads on which are adapted to fit and engage. the

internal threads in the sleeve 0.. This sleeve E is also provided with oneor more slots E adapted to receive the stud or. studs a on the collet A. The lower. end'. of the longitudinal opening in the sleeve E is contrasted to a diameter equal to th'e diameter of the drill to he used therewith. This eontracted opening 'E (see Figs. 4 At 5) has one or more'proiectijons e adapted to enter the groovelor grooves Bli'nthe -sides of the drill B as shown in Figs. 1 i 5, Itis obvious that the sleeve E will rotate ema ate a m h y f-r'neens 'oi the projections e:iollowingithe-grhoiresh 'in the sides thereof, and that therefore wh drill shank it is preiei ahle to make the slots E substantizlly' continuations tr the grooves i m 'drill, so. that as the sleeve E and drill B-are upward by the action of the screw threads the sleeve E. can rotate sufficiently to iollow the grooves in the drill. -Horfrever I this is only necessary tvhe e.drill is provided with a, tang b, as otherwise;

enough to force 'l hapk into the tapered socket in collet.

a on the collet A. The sleeve 0 is n turneduntil the sleeve E and. drill therein'ere y Y held in place. Power is then epplied to "mete the collet which, through the stud a,-;causes the sleeve E and drill to rotate. It isobvious fromth' description that with my device the power.

to drive the .drill is exerted thereupon i i-tathe shrink of the drill, and that thereiore' h ein rib, danger of twisting off the tang b, and sequin drills v without tzings can be used therewith in ordinitry coll Having thus fully described my invention so asto enable others to construct and operate the seine; what- I clsimas'new and desire to secure by lettersfstent of the United States is;

1. Tiie'comhlnatlon in a drill chuck, or a sun cones"?- sl ve having openings-in the wall thereolt, adapted to:

embrace. the lower-end otsald collet and engage the is the object of my invention. To attain this ohficcu i grooves in a drill, and one or more studs in said collet.

string his on the uppcrend oi the 7 a 3, till cenjturn in the collet snfliciently to perniitfthe sleeve Eto be drawn up far passing through the openings in said sleeve, substantially sieeve iiiiinh slots in the walls thereof adapted to -re-- -:'-'1 'celve sa'id studs and having a contracted opening in the as set forth. 7

2. The combination in a drill-chuck, of a drill 'c ollet, one or more studs in said drill-vcolletfa longitudinally slotted sleeve adapted to engage the grooves in a drill and the studs on said 'collet, and means for retaining said sleeve in piece on said eollet, substantially as and for the purpose set forth. 3. The combination in a drlll chuck of a drill coilet having atapered socket therein, an internally v screw threaded sleeve loosely secured upon said "collect, one or more studs on said collet, an externally screw-threaded seem? lower end thereof, and one or more lnternal'projections or' studs in said opening adapted to enter the groovesln a drill, substantially as and for the purpose setforth.

In testimony whereof I aifix my slgnautre, in presence of two witnesses.

ALEXANDER J. Mc-ALLISTIdR.

Witnesses 2 H. M. STURGEON, P. V.; GIFF-OBD. v 

